package com.chazz.dao;

/**
 * description: IsDiscountDao <br>
 * date: 2020/9/22 9:23 <br>
 * author: Chazz <br>
 * version: 1.0 <br>
 */
public interface DiscountDao {
    /**
     * description: selectDiscountById 通过商品的类别id查询折扣数 <br>
     * version: 1.0 <br>
     * date: 2020/9/22 10:31 <br>
     * author: Chazz <br>
     * @param categoryId 商品类别id
     * @return double 返回折扣数
     */ 
     double selectDiscountById(Integer categoryId);
}
